1 files changed, 116 insertions, 0 deletions
diff --git a/src/acf.c b/src/acf.c
new file mode 100644
index 0000000..6975f11
--- /dev/null
+++ b/src/acf.c
@@ -0,0 +1,116 @@
+/*-
+ * Copyright (c) 1999 Brian Somers <brian@Awfulhak.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * $FreeBSD: src/usr.sbin/ppp/acf.c,v 1.7.26.1 2010/12/21 17:10:29 kensmith Exp $
+ */
+
+#include <sys/types.h>
+
+#include <stdio.h>
+#include <termios.h>
+
+#include "defs.h"
+#include "layer.h"
+#include "timer.h"
+#include "fsm.h"
+#include "log.h"
+#include "mbuf.h"
+#include "acf.h"
+#include "proto.h"
+#include "throughput.h"
+#include "lqr.h"
+#include "hdlc.h"
+#include "lcp.h"
+#include "ccp.h"
+#include "link.h"
+#include "descriptor.h"
+#include "async.h"
+#include "physical.h"
+
+int
+acf_WrapperOctets(struct lcp *lcp, u_short proto)
+{
+  return (proto == PROTO_LCP || lcp->his_acfcomp == 0) ? 2 : 0;
+}
+
+static struct mbuf *
+acf_LayerPush(struct bundle *b __unused, struct link *l, struct mbuf *bp,
+              int pri __unused, u_short *proto)
+{
+  const u_char cp[2] = { HDLC_ADDR, HDLC_UI };
+
+  if (*proto == PROTO_LCP || l->lcp.his_acfcomp == 0) {
+    bp = m_prepend(bp, cp, 2, 0);
+    m_settype(bp, MB_ACFOUT);
+  }
+
+  return bp;
+}
+
+static struct mbuf *
+acf_LayerPull(struct bundle *b __unused, struct link *l, struct mbuf *bp,
+	      u_short *proto __unused)
+{
+  struct physical *p = link2physical(l);
+  u_char cp[2];
+
+  if (!p) {
+    log_Printf(LogERROR, "Can't Pull an acf packet from a logical link\n");
+    return bp;
+  }
+
+  if (mbuf_View(bp, cp, 2) == 2) {
+    if (!p->link.lcp.want_acfcomp) {
+      /* We expect the packet not to be compressed */
+      bp = mbuf_Read(bp, cp, 2);
+      if (cp[0] != HDLC_ADDR) {
+        p->hdlc.lqm.ifInErrors++;
+        p->hdlc.stats.badaddr++;
+        log_Printf(LogDEBUG, "acf_LayerPull: addr 0x%02x\n", cp[0]);
+        m_freem(bp);
+        return NULL;
+      }
+      if (cp[1] != HDLC_UI) {
+        p->hdlc.lqm.ifInErrors++;
+        p->hdlc.stats.badcommand++;
+        log_Printf(LogDEBUG, "acf_LayerPull: control 0x%02x\n", cp[1]);
+        m_freem(bp);
+        return NULL;
+      }
+      m_settype(bp, MB_ACFIN);
+    } else if (cp[0] == HDLC_ADDR && cp[1] == HDLC_UI) {
+      /*
+       * We can receive compressed packets, but the peer still sends
+       * uncompressed packets (or maybe this is a PROTO_LCP packet) !
+       */
+      bp = mbuf_Read(bp, cp, 2);
+      m_settype(bp, MB_ACFIN);
+    }
+  }
+
+  return bp;
+}
+
+struct layer acflayer = { LAYER_ACF, "acf", acf_LayerPush, acf_LayerPull };